Facebook has made moves to tighten its grip on documents regarding Cambridge Analytica that plaintiffs lawyers are seeking to help build their shareholder derivative lawsuit in district court.

Attorneys at Gibson, Dunn & Crutcher filed a motion for a permanent injunction Thursday in the U.S. District Court for the Northern District of California on behalf of the tech company. In March, U.S. District Judge Haywood Gilliam Jr. of the Northern District of California tossed out most claims in a shareholder derivative suit against Facebook, ruling that shareholders would have to make their state law claims through the designated Delaware Court of Chancery. The motion asks the judge to dismiss a 143-page complaint in the Superior Court of the State of California on the same grounds.